Not writing to file
I have a bean with the following constructor, it does not write to the file when used as a bean, but when i create a main method and create an instance of the class and run it as a class the file does not get written to. Why? and how do i make it write to a file when used as a bean
public Taxonamy()
{
try
{
fw = new FileWriter("taxonamyTree.t
fw.write("kjffkjsdafdsj");
fw.flush();
fw.close();
}
catch(IOException e)
{
setError("ERROR OPENING FILE");
}
}
public Taxonamy()
{
try
{
fw = new FileWriter("taxonamyTree.t
fw.write("kjffkjsdafdsj");
fw.flush();
fw.close();
}
catch(IOException e)
{
setError("ERROR OPENING FILE");
}
}
My guess would be the constructor is never called when it's used as a bean...
I'm not sure if this is normal behaviour for Beans, but I guess so, as your code is doing it ;-)
Can't you make the file writing a method, and then call invoke method from the JSP?
I'm not sure if this is normal behaviour for Beans, but I guess so, as your code is doing it ;-)
Can't you make the file writing a method, and then call invoke method from the JSP?
>> My guess would be the constructor is never called when it's used as a bean.
Not really my area, but is this right? Surely a bean constructor must be called somewhere.
Not really my area, but is this right? Surely a bean constructor must be called somewhere.
ASKER
tim: i dont think it is that i just put the code in there for simplicity, it didnt work in other locations of the bean either
ASKER
and the constructer is called
Do you get an exception?
ASKER
it doesn't print to the logs and there is no catalina.out in the tomcat directory
Are you sure there's no catalina.out? It should be in the logs directory below the tomcat installation.
Sounds like a securityexception...
It could be you dont have write privs to that directory (if you are running on Linux/Unix)
You might also be running Tomcat with the security manager, in which case you'll have to grant rights to create this file...
http://dbforums.com/arch/182/2003/8/731227
(at the bottom)
It could be you dont have write privs to that directory (if you are running on Linux/Unix)
You might also be running Tomcat with the security manager, in which case you'll have to grant rights to create this file...
http://dbforums.com/arch/182/2003/8/731227
(at the bottom)
ASKER
jim: yes i perfomed a search for it, and it not there
tim: its windows, ill try that link
tim: its windows, ill try that link
>> fw = new FileWriter("taxonamyTree.t
The file will be created in the dir that tomcat starts from, most likely in tomcat/bin, not the dir where jsp page is. do you have the write permission in tomcat/bin?
The file will be created in the dir that tomcat starts from, most likely in tomcat/bin, not the dir where jsp page is. do you have the write permission in tomcat/bin?
ASKER
when i ran the class in command line i created the file taxonamyTree.txt i the web-inf\classes\..\..\ directory where the class is and it wrote to that file, so why would it write to somewhere different when used in conjuntion to a JSP? but ill gp and check anyway
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ASKER
outstanding ken, and thanks tim
glad to know your problem is resolved :-)
:-)
Good luck!
Good luck!
Where is the bean being used? It may be a permission problem (eg. no write permissions for the directory or file that you are trying to write to).
Try adding the following inside the catch:
System.out.println("IOExce
This should give you some more detail about the exception. (If you're using Tomcat, the output will appear in /logs/catalina.out).